draconisplusplus/include/rfl/parsing/Parser_array.hpp

#ifndef RFL_PARSING_PARSER_ARRAY_HPP_
#define RFL_PARSING_PARSER_ARRAY_HPP_

#include <array>
#include <map>
#include <type_traits>
#include <vector>

#include "../Ref.hpp"
#include "../Result.hpp"
#include "../always_false.hpp"
#include "ArrayReader.hpp"
#include "Parent.hpp"
#include "Parser_base.hpp"
#include "schema/Type.hpp"

namespace rfl {
  namespace parsing {
    template <class R, class W, class T, size_t _size, class ProcessorsType>
      requires AreReaderAndWriter<R, W, std::array<T, _size>>
    struct Parser<R, W, std::array<T, _size>, ProcessorsType> {
     public:
      using InputArrayType = typename R::InputArrayType;
      using InputVarType   = typename R::InputVarType;

      using OutputArrayType = typename W::OutputArrayType;
      using OutputVarType   = typename W::OutputVarType;

      using ParentType = Parent<W>;

      static Result<std::array<T, _size>> read(
          const R& _r,
          const InputVarType& _var) noexcept {
        const auto parse =
            [&](const InputArrayType& _arr) -> Result<std::array<T, _size>> {
          alignas(std::array<T, _size>) unsigned char
              buf[sizeof(std::array<T, _size>)];
          auto ptr = reinterpret_cast<std::array<T, _size>*>(buf);
          const auto array_reader =
              ArrayReader<R, W, ProcessorsType, T, _size>(&_r, ptr);
          auto err = _r.read_array(array_reader, _arr);
          if (err) {
            array_reader.call_destructors_where_necessary();
            return *err;
          }
          err = array_reader.check_size();
          if (err) {
            array_reader.call_destructors_where_necessary();
            return *err;
          }
          return std::move(*ptr);
        };

        return _r.to_array(_var).and_then(parse);
      }

      template <class P>
      static void write(const W& _w,
                        const std::array<T, _size>& _arr,
                        const P& _parent) noexcept {
        auto arr              = ParentType::add_array(_w, _size, _parent);
        const auto new_parent = typename ParentType::Array {&arr};
        for (const auto& e : _arr) {
          Parser<R, W, std::remove_cvref_t<T>, ProcessorsType>::write(
              _w, e, new_parent);
        }
        _w.end_array(&arr);
      }

      static schema::Type to_schema(
          std::map<std::string, schema::Type>* _definitions) {
        using U = std::remove_cvref_t<T>;
        return schema::Type {schema::Type::FixedSizeTypedArray {
            .size_ = _size,
            .type_ = Ref<schema::Type>::make(
                Parser<R, W, U, ProcessorsType>::to_schema(_definitions))}};
      }
    };

  } // namespace parsing
} // namespace rfl

#endif